The Sierra Club guide to the natural areas of Idaho, Montana, and Wyoming / John Perry and Jane Greverus Perry. Perry, John, 1914- Perry, Jane Greverus. Sierra Club. Natural areas Idaho Guidebooks. Natural areas Montana Guidebooks. Natural areas Wyoming Guidebooks. 917.96 PER Includes bibliographies and index. San Francisco : Sierra Club Books, 1988. 1988. 1988 Text xix, 435 p. : http://www.loc.gov/catdir/description/random047/87026312.html eng Idaho Montana Wyoming